Christian bergh backer



Rei'uued May 4, 1926.

UNITED STATES PATENT OFFICE.

cnnrs'rran annex seem, or nnooxmm, new Yonx, assronoa or Two-rams TO A/S ma uonsxn san'rvnmn, or unseen, uoawar.

r m-men or rnonubmo an Io Drawing. Original 80. 1,451,?

application t r reissue comrouma,

To all whom it may concern:

Be it known that I; Cmus'rmn Bnncn BACKEB, a subject of the King of Norway, and a resident of Brooklyn, county of Kings, 5 State of New York, formerly residing at Bergen, Norway, useful Method of have invented a new and Producing an Adherent Coating of an Oxygenous Magnesium Compound, and Object Comprising Same, of which the following is a specification.

This invention has for its object a method of treating objects or materials part1 wholly of magnes or ium or magnesium alloys so as to produce upon the metal a strongly adhering coating Such a novel of substantial thickness.

coating is not only an electrical insulator, but is chemically resistant to salt solutions and the 1 comprises objects ike, and the invention also or materials so coated.

Accordingto the invention such coatin s are produced from the metal itself by su jecting it to an oxidizing treatment, the 1ntensity to the duced.

and duration of which is adapted thickness of the coating to be pro- The coating is suitablyproduced by subjecting the objects or materials, whic may consist of magnesium or a magnesium alloy or which may only have a surface layer of such metal or alloy-to the action of water or water vapour 100 C. y

of magnesium by such a treatmen tain a compact strongly at a temperature above 't it is po'ssible a obadhering coating droxide, the thickness of which may be controlled by suitable variations in the temperatures employed and in the duration of the treatment.

As'an example may heating an object of clave under a steam 15 minutes a coating of thickness has been obtained atmospheres in about 1.5 mm. and by boiling in ressure of about of about 0.2 mm. duced. 4

The coating is an be mentioned that by magnesium in an autopressure of about 10 about one hour under a 5 atmospheres a coating thicknesshas been proelectrical insulator and sses great resistance against the action of the constituents of the atmosphere. The

present process is insulation of elec therefore adaptable to the trical conductors insula- -with water glass solutions during or a annnnnm' comma or AN oxremvous mansion am: omsc'r comrnrsmc same.

55, emu April 17, 1923, Serial m. 522,941, mm December is, 1001.

filed January 29, 1925. Serial No. 6,500.

stamping or b other methods, whereupon they may be su jected to the described treatment.

The coating produced in the described manner reslstsv t e influence of chemically acting substances, for example salt solutions and the like and magnesium or magnesium alloys provided with the same coating may therefore be employed where guch substances are present, for example in sea. water (for example for crank'cases and the like for ship motors).

It is known to efiect the insulation of aluminum conductors by providing the same with a coating of aluminum hydroxide. As compared with such aluminum hydroxide coatings, the coating of magnesium hydroxide reduced accordin to the present invention is fundamental y different in several respects for example therein that the coating may be produced in an desired thickness so that it is applicab 0 also for high tension currents. a

The coating is hard and tough and of great cohesive wer and it is strongly adhering so that 1t does not fall ofi when the objects are subjected to mechanical strain. By means of impregnation for examfple r the glrocess of producing same, the strength of t e coating ma be increased and its character may be a tered. When impregnation with water glass is made use of a subsraquent treatment with an acid will be suit-. a le.

The described method may also be employed for the production of objects which all through consist of ide, the oxidizing treatment of the shaped object being in this case continued until the entire metal is converted. In this case the magnesium hydroxobjects may beforehand have been shaped of massive metal or for example of a powder of the metal or alloy.

As is well known magnesium metal when boiled in water under ordinary pressure becomes covered with a layer of magnesium h droxide. This layeris, however,.so thin t it is unmeasurable with a micrometer, and no method was known, whereb a layer ofa thickness above 0.01 mm. coul be produced. y

I claim:

1. Method of produc' a coating" upon objects and materials di magnesium andma esium alloys which comprises .heating of as objects in the presence of water under pressure at a temperature of above 100 C.

2. Method of treating objects andmaterials of m esium or magnesium alloys which comprises heating the objects under a superatmospherical pressure at a temperature above 100 C. inthe presence of'water and continuing this treatment until the magnesium metal of the object has been coninto an oxy nous magnesium compound to a depth at least 0.01 mm.-

3. Method of treating materials and objects of magnesium or magnesium alloys to produce an electrically insulating coating thereupon which comprises heating of the objects under a pressure of several atmospheres at a temperature above 100 C. in the presence of water.

4. Method of producing an electrically insulating coating upon the windings of trans-' formers, motors and other electrical apparatus according to claim 1 which comprises producmg a thin layer comprising magnesium upon the conductors before winding,

then bringing the conductors into osition and then subjecting the formed 0 ject to the oxidizing treatment until a coating of desired thickness has been produced.

5. Objects and materials of ma nesium or magnesium alloys having a bar adhering ooatingpf a thickness of at least 0.01 mm. comprising an oxygeneous magnesium-compound, produced from the metal itself.

6. Metal objects and materials having a hard adhering coating of a thickness of atleast .01 mm. comprising an oxygenous magnesium compoun 7. Metal objects and materials havin a hard adhering coating of a thickness 0 at least .01 mm. comprising a hydrated oxyous magnesium compound having the c aracteristics of a coating produced when magnesium is heated in the presence of water \11510 garb pressure at a temperature above 8..An electrical conductor having-an ining coating comprising a hard adhering coating of an oxygenous magnesium compound.

Tti'on in the apparatus,

9. An electrical conductor having an insulating coating of a hydrated oxygenous magnesium compound;

adhering insulating coating of a hydrated oxygenous magnesium compound having a th ckness of at least .01 mm.

12. A formed insulator comprising a hard adhering non-conducting oxygenous magnesium compound.

13. An insulated conductor including a 'layer of hard adhering hydrated oxygenous magnesium compound of a thickness of at least .01 mm. v

14. The method of producing electrical apparatus which consists in applying a su 1 face layer embodying magnesium metal to a conductor, placing such conductor in posiand then subjecting the said layer to the action of water under pressure at a temperature in excess of 100 C. i I

15. The method of constructing electrical apparatus which consists in applyin a coat-. ing of magnesium on a conductor of the apparatus, placing the conductor in position in the apparatus, and then treating the ap-.

paratus in water under pressure at a temperature above 100 C. to convert all the magnesium to magnesium hydroxide.

16. Process of insulating a formed located winding inan electric heating a paratus or the like consisting in forming an locating a winding having a covering comprising magnesium metal in final form in the apparatus, and heating the apparatus under superatmospherical pressure at a temperature above 100 C. in the resence of water until said covering metal 15 converted to a hard adherenthydrated oxygenous coating of a thickness of at least 0.01 mm.

17. Process of insulating a formed located winding in an electric heating apparatus or the like consistingin forming and locating a winding with a covering comprising metallic magnesium in final form in the apparatus, and heating the apparatus under superatmospherical 1003C. in t e presence of water until the coating metal is converted to hard adherent magnesium hydroxide.

18. The method of constructing an electrical apparatus which consists in apglying magnesium metal on a conductor of t e apparatus, placing the conductor in position 1n the apparatus, and then so treating the apparatus in oxygenoushydro enous vapor at such temperature as to pro uce a hard adhering coating of a hydrated oxygenous magnesium compound.

In testimony whereof I afiix my si ature.

CHRISTIAN BERGH BAG R.

gressure at a temperature above 

